原生PHP 调用原生GD库 生成海报

Posted 2022-01-31 哈尔滨洛弘科技有限公司

      $config=['background'=>'海报背景图',
            'image'=>[
                ['src' => '图片地址1', 'left' => '距左边距', 'top' => '距上边距', 'opacity' => '透明度 0.1-1', 'width' =>'宽度', 'height' => '高度']
                ,
                ['src' => '图片地址2', 'left' => '距左边距', 'top' => '距上边距', 'opacity' => '透明度 0.1-1', 'width' =>'宽度', 'height' => '高度']

            ],
            'text'=>[
                ['text'=>'文字内容1', 'left' => '距左边距', 'top' => '距上边距','fontSize'=>'字号','transform'=>'字体角度','fontPath'=>'文字字体路径'],
                ['text'=>'文字内容2', 'left' => '距左边距', 'top' => '距上边距','fontColor'=>'字体颜色','transform'=>'字体角度','fontPath'=>'文字字体路径']
            ]];

             /**
     * 创建海报
     * @param array $config 生成海报的配置
     * @param string $filename 生成后保存地址
     * @return bool|string
     */
    function createPoster($config = array(), $filename = "")
    
        //如果要看报什么错，可以先注释调这个header
        ini_set('default_socket_timeout', 1);
        if (empty($filename)) header("content-type: image/png");
        $imageDefault = [
            'left' => 0,
            'top' => 0,
            'right' => 0,
            'bottom' => 0,
            'width' => 100,
            'height' => 100,
            'opacity' => 100
        ];
        $textDefault = [
            'text' => '',
            'left' => 0,
            'top' => 0,
            'fontSize' => 32,       //字号
            'fontColor' => '255,255,255', //字体颜色
            'angle' => 0,
        ];
  
        $background = $config['background'];//海报最底层得背景
        //背景方法
        $backgroundInfo = getimagesize($background);
        $backgroundFun = 'imagecreatefrom' . image_type_to_extension($backgroundInfo[2], false);
        $background = $backgroundFun($background);
        $backgroundWidth = $backgroundInfo[0];  //背景宽度
        $backgroundHeight = $backgroundInfo[1];  //背景高度
        $imageRes = imageCreatetruecolor($backgroundWidth, $backgroundHeight);
        $color = imagecolorallocate($imageRes, 0, 0, 0);
        //imageColorTransparent($imageRes, $color);  //颜色透明
        imagefill($imageRes, 0, 0, $color);
        imagecopyresampled($imageRes, $background, 0, 0, 0, 0, $backgroundInfo[0], $backgroundInfo[1], imagesx($background), imagesy($background));
        //处理了图片
        if (!empty($config['image'])) 
            foreach ($config['image'] as $key => $val) 
                $val = array_merge($imageDefault, $val);
                if (strpos($val['src'], 'http://thirdwx.qlogo.cn') === false) 
                    $info = getimagesize($val['src']);
                    $function = 'imagecreatefrom' . image_type_to_extension($info[2], false);
                    if (!empty($val['stream']))    //如果传的是字符串图像流
                        $info = getimagesizefromstring($val['src']);
                        $function = 'imagecreatefromstring';
                    

                    $res = $function($val['src']);
                    $resWidth = $info[0];
                    $resHeight = $info[1];
                    //建立画板 ，缩放图片至指定尺寸
                    $canvas = imagecreatetruecolor($val['width'], $val['height']);
                    imageColorTransparent($canvas, $color);
                    imagefill($canvas, 0, 0, $color);
                    //关键函数，参数（目标资源，源，目标资源的开始坐标x,y, 源资源的开始坐标x,y,目标资源的宽高w,h,源资源的宽高w,h）

                    imagecopyresampled($canvas, $res, 0, 0, 0, 0, $val['width'], $val['height'], $resWidth, $resHeight);
                 else 
                    $res = imagecreatefromjpeg($val['src']);
                    $resWidth = 132;
                    $resHeight = 132;
                    $canvas = imagecreatetruecolor($val['width'], $val['height']);
                    imageColorTransparent($canvas, $color);
                    imagefill($canvas, 0, 0, $color);
                    //关键函数，参数（目标资源，源，目标资源的开始坐标x,y, 源资源的开始坐标x,y,目标资源的宽高w,h,源资源的宽高w,h）
                    imagecopyresampled($canvas, $res, 0, 0, 0, 0, $val['width'], $val['height'], $resWidth, $resHeight);
                
                $val['left'] = $val['left'] < 0 ? $backgroundWidth - abs($val['left']) - $val['width'] : $val['left'];
                $val['top'] = $val['top'] < 0 ? $backgroundHeight - abs($val['top']) - $val['height'] : $val['top'];
                //放置图像
                imagecopymerge($imageRes, $canvas, $val['left'], $val['top'], 0, 0, $val['width'], $val['height'], $val['opacity'] * 100);//左，上，右，下，宽度，高度，透明度
            
        
        //处理文字
        if (!empty($config['text'])) 
            foreach ($config['text'] as $key => $val) 
                $val['fontPath'] = '/static/index/simhei.ttf';
                $val = array_merge($textDefault, $val);
                if (strpos('rgb', $val['color']) === false) 
                    $rgb = self::hex2rgb($val['color']);
                    $fontColor = imagecolorallocate($imageRes, $rgb['r'], $rgb['g'], $rgb['b']);
                 else 
                    $val['color'] = str_replace('rgb(', '', $val['color']);
                    $val['color'] = str_replace(')', '', $val['color']);
                    list($R, $G, $B) = explode(',', $val['color']);
                    $fontColor = imagecolorallocate($imageRes, $R, $G, $B);
                
                $val['left'] = $val['left'] < 0 ? $backgroundWidth - abs($val['left']) : $val['left'];
                $val['top'] = $val['top'] < 0 ? $backgroundHeight - abs($val['top']) : $val['top'];
                imagettftext($imageRes, $val['font_size'], -$val['transform'], $val['left'], $val['top'] + $val['font_size'], $fontColor, $val['fontPath'], $val['text']);
            
        
        //生成图片
        if (!empty($filename)) 
            $res = imagepng($imageRes, $filename); //保存到本地
            imagedestroy($imageRes);
            if (!$res) return false;
            return $filename;
         else 
            imagepng($imageRes);     //在浏览器上显示
            imagedestroy($imageRes);
        
    
    //直接调用即可使用
    createPoster($config,'文件保存地址');

如果您的php没有GD库，请看下面安装GD库
liunx安装教程
安装教程
Windows安装教程
把你PHP目录下的ext文件夹里的php_gd2.dll复制到系统目录下,然后修改你的PHP.ini文件,找到以下位置
;extension=php_gd2.dll
把前面的;去掉…
重启你的网页服务器apache或者IIS就可以了